How to call an activity from java, javascript in Pega?

Pega - Interview Questions

Or you can use osafeURL to call an activity

Using Java :

sHashStringMapactivityKeys = new HashStringMap();
activityKeys.putString(“pxObjClass”, “Rule-Obj-Activity”);
activityKeys.putString(“pyClassName”, workclass);
activityKeys.putString(“pyActivityName”, “HistoryAndAttachments” );
tools.doActivity(activityKeys , workpage, tools.getParameterPage() );